1 /** \file
2 * Pen event context implementation.
3 */
5 /*
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak <buliabyak@users.sf.net>
9 *
10 * Copyright (C) 2000 Lauris Kaplinski
11 * Copyright (C) 2000-2001 Ximian, Inc.
12 * Copyright (C) 2002 Lauris Kaplinski
13 * Copyright (C) 2004 Monash University
14 *
15 * Released under GNU GPL, read the file 'COPYING' for more information
16 */
18 #include <gdk/gdkkeysyms.h>
19 #include <cstring>
20 #include <string>
22 #include "pen-context.h"
23 #include "sp-namedview.h"
24 #include "sp-metrics.h"
25 #include "desktop.h"
26 #include "desktop-handles.h"
27 #include "selection.h"
28 #include "selection-chemistry.h"
29 #include "draw-anchor.h"
30 #include "message-stack.h"
31 #include "message-context.h"
32 #include "preferences.h"
33 #include "sp-path.h"
34 #include "display/sp-canvas.h"
35 #include "display/curve.h"
36 #include "pixmaps/cursor-pen.xpm"
37 #include "display/canvas-bpath.h"
38 #include "display/sp-ctrlline.h"
39 #include "display/sodipodi-ctrl.h"
40 #include <glibmm/i18n.h>
41 #include "libnr/nr-point-ops.h"
42 #include "helper/units.h"
43 #include "macros.h"
44 #include "context-fns.h"
45 #include "tools-switch.h"
47 static void sp_pen_context_class_init(SPPenContextClass *klass);
48 static void sp_pen_context_init(SPPenContext *pc);
49 static void sp_pen_context_dispose(GObject *object);
51 static void sp_pen_context_setup(SPEventContext *ec);
52 static void sp_pen_context_finish(SPEventContext *ec);
53 static void sp_pen_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
54 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
55 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
57 static void spdc_pen_set_initial_point(SPPenContext *pc, Geom::Point const p);
58 static void spdc_pen_set_subsequent_point(SPPenContext *const pc, Geom::Point const p, bool statusbar, guint status = 0);
59 static void spdc_pen_set_ctrl(SPPenContext *pc, Geom::Point const p, guint state);
60 static void spdc_pen_finish_segment(SPPenContext *pc, Geom::Point p, guint state);
62 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
64 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
65 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
66 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
67 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
68 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
69 static void spdc_reset_colors(SPPenContext *pc);
71 static void pen_disable_events(SPPenContext *const pc);
72 static void pen_enable_events(SPPenContext *const pc);
74 static Geom::Point pen_drag_origin_w(0, 0);
75 static bool pen_within_tolerance = false;
77 static SPDrawContextClass *pen_parent_class;
79 static int pen_next_paraxial_direction(const SPPenContext *const pc, Geom::Point const &pt, Geom::Point const &origin, guint state);
80 static void pen_set_to_nearest_horiz_vert(const SPPenContext *const pc, Geom::Point &pt, guint const state, bool snap);
82 static int pen_last_paraxial_dir = 0; // last used direction in horizontal/vertical mode; 0 = horizontal, 1 = vertical
84 /**
85 * Register SPPenContext with Gdk and return its type.
86 */
87 GType
88 sp_pen_context_get_type(void)
89 {
90 static GType type = 0;
91 if (!type) {
92 GTypeInfo info = {
93 sizeof(SPPenContextClass),
94 NULL, NULL,
95 (GClassInitFunc) sp_pen_context_class_init,
96 NULL, NULL,
97 sizeof(SPPenContext),
98 4,
99 (GInstanceInitFunc) sp_pen_context_init,
100 NULL, /* value_table */
101 };
102 type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
103 }
104 return type;
105 }
107 /**
108 * Initialize the SPPenContext vtable.
109 */
110 static void
111 sp_pen_context_class_init(SPPenContextClass *klass)
112 {
113 GObjectClass *object_class;
114 SPEventContextClass *event_context_class;
116 object_class = (GObjectClass *) klass;
117 event_context_class = (SPEventContextClass *) klass;
119 pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
121 object_class->dispose = sp_pen_context_dispose;
123 event_context_class->setup = sp_pen_context_setup;
124 event_context_class->finish = sp_pen_context_finish;
125 event_context_class->set = sp_pen_context_set;
126 event_context_class->root_handler = sp_pen_context_root_handler;
127 event_context_class->item_handler = sp_pen_context_item_handler;
128 }
130 /**
131 * Callback to initialize SPPenContext object.
132 */
133 static void
134 sp_pen_context_init(SPPenContext *pc)
135 {
137 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
139 event_context->cursor_shape = cursor_pen_xpm;
140 event_context->hot_x = 4;
141 event_context->hot_y = 4;
143 pc->npoints = 0;
144 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
145 pc->state = SP_PEN_CONTEXT_POINT;
147 pc->c0 = NULL;
148 pc->c1 = NULL;
149 pc->cl0 = NULL;
150 pc->cl1 = NULL;
152 pc->events_disabled = 0;
154 pc->num_clicks = 0;
155 pc->waiting_LPE = NULL;
156 pc->waiting_item = NULL;
157 }
159 /**
160 * Callback to destroy the SPPenContext object's members and itself.
161 */
162 static void
163 sp_pen_context_dispose(GObject *object)
164 {
165 SPPenContext *pc;
167 pc = SP_PEN_CONTEXT(object);
169 if (pc->c0) {
170 gtk_object_destroy(GTK_OBJECT(pc->c0));
171 pc->c0 = NULL;
172 }
173 if (pc->c1) {
174 gtk_object_destroy(GTK_OBJECT(pc->c1));
175 pc->c1 = NULL;
176 }
177 if (pc->cl0) {
178 gtk_object_destroy(GTK_OBJECT(pc->cl0));
179 pc->cl0 = NULL;
180 }
181 if (pc->cl1) {
182 gtk_object_destroy(GTK_OBJECT(pc->cl1));
183 pc->cl1 = NULL;
184 }
186 G_OBJECT_CLASS(pen_parent_class)->dispose(object);
188 if (pc->expecting_clicks_for_LPE > 0) {
189 // we received too few clicks to sanely set the parameter path so we remove the LPE from the item
190 sp_lpe_item_remove_current_path_effect(pc->waiting_item, false);
191 }
192 }
194 void
195 sp_pen_context_set_polyline_mode(SPPenContext *const pc) {
196 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
197 guint mode = prefs->getInt("/tools/freehand/pen/freehand-mode", 0);
198 pc->polylines_only = (mode == 2 || mode == 3);
199 pc->polylines_paraxial = (mode == 3);
200 }
202 /**
203 * Callback to initialize SPPenContext object.
204 */
205 static void
206 sp_pen_context_setup(SPEventContext *ec)
207 {
208 SPPenContext *pc;
210 pc = SP_PEN_CONTEXT(ec);
212 if (((SPEventContextClass *) pen_parent_class)->setup) {
213 ((SPEventContextClass *) pen_parent_class)->setup(ec);
214 }
216 /* Pen indicators */
217 pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
218 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
219 pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
220 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
221 pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
222 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
223 pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
224 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
226 sp_canvas_item_hide(pc->c0);
227 sp_canvas_item_hide(pc->c1);
228 sp_canvas_item_hide(pc->cl0);
229 sp_canvas_item_hide(pc->cl1);
231 sp_event_context_read(ec, "mode");
233 pc->anchor_statusbar = false;
235 sp_pen_context_set_polyline_mode(pc);
237 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
238 if (prefs->getBool("/tools/freehand/pen/selcue")) {
239 ec->enableSelectionCue();
240 }
241 }
243 static void
244 pen_cancel (SPPenContext *const pc)
245 {
246 pc->num_clicks = 0;
247 pc->state = SP_PEN_CONTEXT_STOP;
248 spdc_reset_colors(pc);
249 sp_canvas_item_hide(pc->c0);
250 sp_canvas_item_hide(pc->c1);
251 sp_canvas_item_hide(pc->cl0);
252 sp_canvas_item_hide(pc->cl1);
253 pc->_message_context->clear();
254 pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
256 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
257 }
259 /**
260 * Finalization callback.
261 */
262 static void
263 sp_pen_context_finish(SPEventContext *ec)
264 {
265 SPPenContext *pc = SP_PEN_CONTEXT(ec);
267 sp_event_context_discard_delayed_snap_event(ec);
269 if (pc->npoints != 0) {
270 pen_cancel (pc);
271 }
273 if (((SPEventContextClass *) pen_parent_class)->finish) {
274 ((SPEventContextClass *) pen_parent_class)->finish(ec);
275 }
276 }
278 /**
279 * Callback that sets key to value in pen context.
280 */
281 static void
282 sp_pen_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
283 {
284 SPPenContext *pc = SP_PEN_CONTEXT(ec);
285 Glib::ustring name = val->getEntryName();
287 if (name == "mode") {
288 if ( val->getString() == "drag" ) {
289 pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
290 } else {
291 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
292 }
293 }
294 }
296 /**
297 * Snaps new node relative to the previous node.
298 */
299 static void
300 spdc_endpoint_snap(SPPenContext const *const pc, Geom::Point &p, guint const state)
301 {
302 if ((state & GDK_CONTROL_MASK) && !pc->polylines_paraxial) { //CTRL enables angular snapping
303 if (pc->npoints > 0) {
304 spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
305 }
306 } else {
307 // We cannot use shift here to disable snapping because the shift-key is already used
308 // to toggle the paraxial direction; if the user wants to disable snapping (s)he will
309 // have to use the %-key, the menu, or the snap toolbar
310 if ((pc->npoints > 0) && pc->polylines_paraxial) {
311 // snap constrained
312 pen_set_to_nearest_horiz_vert(pc, p, state, true);
313 } else {
314 // snap freely
315 spdc_endpoint_snap_free(pc, p, state);
316 }
317 }
318 }
320 /**
321 * Snaps new node's handle relative to the new node.
322 */
323 static void
324 spdc_endpoint_snap_handle(SPPenContext const *const pc, Geom::Point &p, guint const state)
325 {
326 g_return_if_fail(( pc->npoints == 2 ||
327 pc->npoints == 5 ));
329 if ((state & GDK_CONTROL_MASK)) { //CTRL enables angular snapping
330 spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
331 } else {
332 if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
333 spdc_endpoint_snap_free(pc, p, state);
334 }
335 }
336 }
338 static gint
339 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
340 {
341 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
343 gint ret = FALSE;
345 switch (event->type) {
346 case GDK_BUTTON_PRESS:
347 ret = pen_handle_button_press(pc, event->button);
348 break;
349 case GDK_BUTTON_RELEASE:
350 ret = pen_handle_button_release(pc, event->button);
351 break;
352 default:
353 break;
354 }
356 if (!ret) {
357 if (((SPEventContextClass *) pen_parent_class)->item_handler)
358 ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
359 }
361 return ret;
362 }
364 /**
365 * Callback to handle all pen events.
366 */
367 static gint
368 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
369 {
370 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
372 gint ret = FALSE;
374 switch (event->type) {
375 case GDK_BUTTON_PRESS:
376 ret = pen_handle_button_press(pc, event->button);
377 break;
379 case GDK_MOTION_NOTIFY:
380 ret = pen_handle_motion_notify(pc, event->motion);
381 break;
383 case GDK_BUTTON_RELEASE:
384 ret = pen_handle_button_release(pc, event->button);
385 break;
387 case GDK_2BUTTON_PRESS:
388 ret = pen_handle_2button_press(pc, event->button);
389 break;
391 case GDK_KEY_PRESS:
392 ret = pen_handle_key_press(pc, event);
393 break;
395 default:
396 break;
397 }
399 if (!ret) {
400 gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
401 = ((SPEventContextClass *) pen_parent_class)->root_handler;
402 if (parent_root_handler) {
403 ret = parent_root_handler(ec, event);
404 }
405 }
407 return ret;
408 }
410 /**
411 * Handle mouse button press event.
412 */
413 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
414 {
415 if (pc->events_disabled) {
416 // skip event processing if events are disabled
417 return FALSE;
418 }
420 SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
421 SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
422 Geom::Point const event_w(bevent.x, bevent.y);
423 Geom::Point event_dt(desktop->w2d(event_w));
424 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
426 gint ret = FALSE;
427 if (bevent.button == 1 && !event_context->space_panning
428 // make sure this is not the last click for a waiting LPE (otherwise we want to finish the path)
429 && pc->expecting_clicks_for_LPE != 1) {
431 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
432 return TRUE;
433 }
435 if (!pc->grab ) {
436 /* Grab mouse, so release will not pass unnoticed */
437 pc->grab = SP_CANVAS_ITEM(desktop->acetate);
438 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
439 GDK_BUTTON_RELEASE_MASK |
440 GDK_POINTER_MOTION_MASK ),
441 NULL, bevent.time);
442 }
444 pen_drag_origin_w = event_w;
445 pen_within_tolerance = true;
447 /* Test whether we hit any anchor. */
448 SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
450 switch (pc->mode) {
451 case SP_PEN_CONTEXT_MODE_CLICK:
452 /* In click mode we add point on release */
453 switch (pc->state) {
454 case SP_PEN_CONTEXT_POINT:
455 case SP_PEN_CONTEXT_CONTROL:
456 case SP_PEN_CONTEXT_CLOSE:
457 break;
458 case SP_PEN_CONTEXT_STOP:
459 /* This is allowed, if we just canceled curve */
460 pc->state = SP_PEN_CONTEXT_POINT;
461 break;
462 default:
463 break;
464 }
465 break;
466 case SP_PEN_CONTEXT_MODE_DRAG:
467 switch (pc->state) {
468 case SP_PEN_CONTEXT_STOP:
469 /* This is allowed, if we just canceled curve */
470 case SP_PEN_CONTEXT_POINT:
471 if (pc->npoints == 0) {
473 Geom::Point p;
474 if ((bevent.state & GDK_CONTROL_MASK) && (pc->polylines_only || pc->polylines_paraxial)) {
475 p = event_dt;
476 if (!(bevent.state & GDK_SHIFT_MASK)) {
477 SnapManager &m = desktop->namedview->snap_manager;
478 m.setup(desktop);
479 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE);
480 m.unSetup();
481 }
482 spdc_create_single_dot(event_context, p, "/tools/freehand/pen", bevent.state);
483 ret = TRUE;
484 break;
485 }
487 // TODO: Perhaps it would be nicer to rearrange the following case
488 // distinction so that the case of a waiting LPE is treated separately
490 /* Set start anchor */
491 pc->sa = anchor;
492 if (anchor && !sp_pen_context_has_waiting_LPE(pc)) {
493 /* Adjust point to anchor if needed; if we have a waiting LPE, we need
494 a fresh path to be created so don't continue an existing one */
495 p = anchor->dp;
496 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
497 } else {
498 // This is the first click of a new curve; deselect item so that
499 // this curve is not combined with it (unless it is drawn from its
500 // anchor, which is handled by the sibling branch above)
501 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
502 if (!(bevent.state & GDK_SHIFT_MASK) || sp_pen_context_has_waiting_LPE(pc)) {
503 /* if we have a waiting LPE, we need a fresh path to be created
504 so don't append to an existing one */
505 selection->clear();
506 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
507 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
508 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
509 }
511 /* Create green anchor */
512 p = event_dt;
513 spdc_endpoint_snap(pc, p, bevent.state);
514 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
515 }
516 spdc_pen_set_initial_point(pc, p);
517 } else {
519 /* Set end anchor */
520 pc->ea = anchor;
521 Geom::Point p;
522 if (anchor) {
523 p = anchor->dp;
524 // we hit an anchor, will finish the curve (either with or without closing)
525 // in release handler
526 pc->state = SP_PEN_CONTEXT_CLOSE;
528 if (pc->green_anchor && pc->green_anchor->active) {
529 // we clicked on the current curve start, so close it even if
530 // we drag a handle away from it
531 dc->green_closed = TRUE;
532 }
533 ret = TRUE;
534 break;
536 } else {
537 p = event_dt;
538 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
539 spdc_pen_set_subsequent_point(pc, p, true);
540 }
541 }
543 pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
544 ret = TRUE;
545 break;
546 case SP_PEN_CONTEXT_CONTROL:
547 g_warning("Button down in CONTROL state");
548 break;
549 case SP_PEN_CONTEXT_CLOSE:
550 g_warning("Button down in CLOSE state");
551 break;
552 default:
553 break;
554 }
555 break;
556 default:
557 break;
558 }
559 } else if (pc->expecting_clicks_for_LPE == 1 && pc->npoints != 0) {
560 // when the last click for a waiting LPE occurs we want to finish the path
561 spdc_pen_finish_segment(pc, event_dt, bevent.state);
562 if (pc->green_closed) {
563 // finishing at the start anchor, close curve
564 spdc_pen_finish(pc, TRUE);
565 } else {
566 // finishing at some other anchor, finish curve but not close
567 spdc_pen_finish(pc, FALSE);
568 }
570 ret = TRUE;
571 } else if (bevent.button == 3 && pc->npoints != 0) {
572 // right click - finish path
573 spdc_pen_finish(pc, FALSE);
574 ret = TRUE;
575 }
577 if (pc->expecting_clicks_for_LPE > 0) {
578 --pc->expecting_clicks_for_LPE;
579 }
581 return ret;
582 }
584 /**
585 * Handle motion_notify event.
586 */
587 static gint
588 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
589 {
590 gint ret = FALSE;
592 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
593 SPDesktop * const dt = SP_EVENT_CONTEXT_DESKTOP(event_context);
595 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
596 // allow scrolling
597 return FALSE;
598 }
600 if (pc->events_disabled) {
601 // skip motion events if pen events are disabled
602 return FALSE;
603 }
605 Geom::Point const event_w(mevent.x,
606 mevent.y);
607 if (pen_within_tolerance) {
608 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
609 gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
610 if ( Geom::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
611 return FALSE; // Do not drag if we're within tolerance from origin.
612 }
613 }
614 // Once the user has moved farther than tolerance from the original location
615 // (indicating they intend to move the object, not click), then always process the
616 // motion notify coordinates as given (no snapping back to origin)
617 pen_within_tolerance = false;
619 /* Find desktop coordinates */
620 Geom::Point p = dt->w2d(event_w);
622 /* Test, whether we hit any anchor */
623 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
625 switch (pc->mode) {
626 case SP_PEN_CONTEXT_MODE_CLICK:
627 switch (pc->state) {
628 case SP_PEN_CONTEXT_POINT:
629 if ( pc->npoints != 0 ) {
630 /* Only set point, if we are already appending */
631 spdc_endpoint_snap(pc, p, mevent.state);
632 spdc_pen_set_subsequent_point(pc, p, true);
633 ret = TRUE;
634 } else if (!sp_event_context_knot_mouseover(pc)) {
635 SnapManager &m = dt->namedview->snap_manager;
636 m.setup(dt);
637 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
638 m.unSetup();
639 }
640 break;
641 case SP_PEN_CONTEXT_CONTROL:
642 case SP_PEN_CONTEXT_CLOSE:
643 /* Placing controls is last operation in CLOSE state */
644 spdc_endpoint_snap(pc, p, mevent.state);
645 spdc_pen_set_ctrl(pc, p, mevent.state);
646 ret = TRUE;
647 break;
648 case SP_PEN_CONTEXT_STOP:
649 /* This is perfectly valid */
650 break;
651 default:
652 break;
653 }
654 break;
655 case SP_PEN_CONTEXT_MODE_DRAG:
656 switch (pc->state) {
657 case SP_PEN_CONTEXT_POINT:
658 if ( pc->npoints > 0 ) {
659 /* Only set point, if we are already appending */
661 if (!anchor) { /* Snap node only if not hitting anchor */
662 spdc_endpoint_snap(pc, p, mevent.state);
663 spdc_pen_set_subsequent_point(pc, p, true, mevent.state);
664 } else {
665 spdc_pen_set_subsequent_point(pc, anchor->dp, false, mevent.state);
666 }
668 if (anchor && !pc->anchor_statusbar) {
669 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
670 pc->anchor_statusbar = true;
671 } else if (!anchor && pc->anchor_statusbar) {
672 pc->_message_context->clear();
673 pc->anchor_statusbar = false;
674 }
676 ret = TRUE;
677 } else {
678 if (anchor && !pc->anchor_statusbar) {
679 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
680 pc->anchor_statusbar = true;
681 } else if (!anchor && pc->anchor_statusbar) {
682 pc->_message_context->clear();
683 pc->anchor_statusbar = false;
684 }
685 if (!sp_event_context_knot_mouseover(pc)) {
686 SnapManager &m = dt->namedview->snap_manager;
687 m.setup(dt);
688 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
689 m.unSetup();
690 }
691 }
692 break;
693 case SP_PEN_CONTEXT_CONTROL:
694 case SP_PEN_CONTEXT_CLOSE:
695 /* Placing controls is last operation in CLOSE state */
697 // snap the handle
698 spdc_endpoint_snap_handle(pc, p, mevent.state);
700 if (!pc->polylines_only) {
701 spdc_pen_set_ctrl(pc, p, mevent.state);
702 } else {
703 spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
704 }
705 gobble_motion_events(GDK_BUTTON1_MASK);
706 ret = TRUE;
707 break;
708 case SP_PEN_CONTEXT_STOP:
709 /* This is perfectly valid */
710 break;
711 default:
712 if (!sp_event_context_knot_mouseover(pc)) {
713 SnapManager &m = dt->namedview->snap_manager;
714 m.setup(dt);
715 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
716 m.unSetup();
717 }
718 break;
719 }
720 break;
721 default:
722 break;
723 }
724 return ret;
725 }
727 /**
728 * Handle mouse button release event.
729 */
730 static gint
731 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
732 {
733 if (pc->events_disabled) {
734 // skip event processing if events are disabled
735 return FALSE;
736 }
738 gint ret = FALSE;
739 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
740 if ( revent.button == 1 && !event_context->space_panning) {
742 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
744 Geom::Point const event_w(revent.x,
745 revent.y);
746 /* Find desktop coordinates */
747 Geom::Point p = pc->desktop->w2d(event_w);
749 /* Test whether we hit any anchor. */
750 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
752 switch (pc->mode) {
753 case SP_PEN_CONTEXT_MODE_CLICK:
754 switch (pc->state) {
755 case SP_PEN_CONTEXT_POINT:
756 if ( pc->npoints == 0 ) {
757 /* Start new thread only with button release */
758 if (anchor) {
759 p = anchor->dp;
760 }
761 pc->sa = anchor;
762 spdc_pen_set_initial_point(pc, p);
763 } else {
764 /* Set end anchor here */
765 pc->ea = anchor;
766 if (anchor) {
767 p = anchor->dp;
768 }
769 }
770 pc->state = SP_PEN_CONTEXT_CONTROL;
771 ret = TRUE;
772 break;
773 case SP_PEN_CONTEXT_CONTROL:
774 /* End current segment */
775 spdc_endpoint_snap(pc, p, revent.state);
776 spdc_pen_finish_segment(pc, p, revent.state);
777 pc->state = SP_PEN_CONTEXT_POINT;
778 ret = TRUE;
779 break;
780 case SP_PEN_CONTEXT_CLOSE:
781 /* End current segment */
782 if (!anchor) { /* Snap node only if not hitting anchor */
783 spdc_endpoint_snap(pc, p, revent.state);
784 }
785 spdc_pen_finish_segment(pc, p, revent.state);
786 spdc_pen_finish(pc, TRUE);
787 pc->state = SP_PEN_CONTEXT_POINT;
788 ret = TRUE;
789 break;
790 case SP_PEN_CONTEXT_STOP:
791 /* This is allowed, if we just canceled curve */
792 pc->state = SP_PEN_CONTEXT_POINT;
793 ret = TRUE;
794 break;
795 default:
796 break;
797 }
798 break;
799 case SP_PEN_CONTEXT_MODE_DRAG:
800 switch (pc->state) {
801 case SP_PEN_CONTEXT_POINT:
802 case SP_PEN_CONTEXT_CONTROL:
803 spdc_endpoint_snap(pc, p, revent.state);
804 spdc_pen_finish_segment(pc, p, revent.state);
805 break;
806 case SP_PEN_CONTEXT_CLOSE:
807 spdc_endpoint_snap(pc, p, revent.state);
808 spdc_pen_finish_segment(pc, p, revent.state);
809 if (pc->green_closed) {
810 // finishing at the start anchor, close curve
811 spdc_pen_finish(pc, TRUE);
812 } else {
813 // finishing at some other anchor, finish curve but not close
814 spdc_pen_finish(pc, FALSE);
815 }
816 break;
817 case SP_PEN_CONTEXT_STOP:
818 /* This is allowed, if we just cancelled curve */
819 break;
820 default:
821 break;
822 }
823 pc->state = SP_PEN_CONTEXT_POINT;
824 ret = TRUE;
825 break;
826 default:
827 break;
828 }
830 if (pc->grab) {
831 /* Release grab now */
832 sp_canvas_item_ungrab(pc->grab, revent.time);
833 pc->grab = NULL;
834 }
836 ret = TRUE;
838 dc->green_closed = FALSE;
839 }
841 // TODO: can we be sure that the path was created correctly?
842 // TODO: should we offer an option to collect the clicks in a list?
843 if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
844 sp_pen_context_set_polyline_mode(pc);
846 SPEventContext *ec = SP_EVENT_CONTEXT(pc);
847 Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
849 if (pc->waiting_LPE) {
850 // we have an already created LPE waiting for a path
851 pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
852 selection->add(SP_OBJECT(pc->waiting_item));
853 pc->waiting_LPE = NULL;
854 } else {
855 // the case that we need to create a new LPE and apply it to the just-drawn path is
856 // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
857 }
858 }
860 return ret;
861 }
863 static gint
864 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
865 {
866 gint ret = FALSE;
867 // only end on LMB double click. Otherwise horizontal scrolling causes ending of the path
868 if (pc->npoints != 0 && bevent.button == 1) {
869 spdc_pen_finish(pc, FALSE);
870 ret = TRUE;
871 }
872 return ret;
873 }
875 void
876 pen_redraw_all (SPPenContext *const pc)
877 {
878 // green
879 if (pc->green_bpaths) {
880 // remove old piecewise green canvasitems
881 while (pc->green_bpaths) {
882 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
883 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
884 }
885 // one canvas bpath for all of green_curve
886 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
887 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
888 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
890 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
891 }
893 if (pc->green_anchor)
894 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
896 pc->red_curve->reset();
897 pc->red_curve->moveto(pc->p[0]);
898 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
899 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
901 // handles
902 if (pc->p[0] != pc->p[1]) {
903 SP_CTRL(pc->c1)->moveto(pc->p[1]);
904 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
905 sp_canvas_item_show (pc->c1);
906 sp_canvas_item_show (pc->cl1);
907 } else {
908 sp_canvas_item_hide (pc->c1);
909 sp_canvas_item_hide (pc->cl1);
910 }
912 Geom::Curve const * last_seg = pc->green_curve->last_segment();
913 if (last_seg) {
914 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
915 if ( cubic &&
916 (*cubic)[2] != to_2geom(pc->p[0]) )
917 {
918 Geom::Point p2 = (*cubic)[2];
919 SP_CTRL(pc->c0)->moveto(p2);
920 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), p2, pc->p[0]);
921 sp_canvas_item_show (pc->c0);
922 sp_canvas_item_show (pc->cl0);
923 } else {
924 sp_canvas_item_hide (pc->c0);
925 sp_canvas_item_hide (pc->cl0);
926 }
927 }
928 }
930 void
931 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
932 {
933 if (pc->npoints != 5)
934 return;
936 // green
937 if (!pc->green_curve->is_empty()) {
938 pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
939 } else {
940 // start anchor too
941 if (pc->green_anchor) {
942 pc->green_anchor->dp += Geom::Point(x, y);
943 }
944 }
946 // red
947 pc->p[0] += Geom::Point(x, y);
948 pc->p[1] += Geom::Point(x, y);
949 pen_redraw_all(pc);
950 }
952 void
953 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
954 {
955 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
956 }
958 void
959 pen_lastpoint_tocurve (SPPenContext *const pc)
960 {
961 if (pc->npoints != 5)
962 return;
964 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( pc->green_curve->last_segment() );
965 if ( cubic ) {
966 pc->p[1] = pc->p[0] + (Geom::Point)( (*cubic)[3] - (*cubic)[2] );
967 } else {
968 pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
969 }
971 pen_redraw_all(pc);
972 }
974 void
975 pen_lastpoint_toline (SPPenContext *const pc)
976 {
977 if (pc->npoints != 5)
978 return;
980 pc->p[1] = pc->p[0];
982 pen_redraw_all(pc);
983 }
986 static gint
987 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
988 {
990 gint ret = FALSE;
991 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
992 gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
994 switch (get_group0_keyval (&event->key)) {
996 case GDK_Left: // move last point left
997 case GDK_KP_Left:
998 case GDK_KP_4:
999 if (!MOD__CTRL) { // not ctrl
1000 if (MOD__ALT) { // alt
1001 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
1002 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
1003 }
1004 else { // no alt
1005 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
1006 else pen_lastpoint_move(pc, -nudge, 0); // no shift
1007 }
1008 ret = TRUE;
1009 }
1010 break;
1011 case GDK_Up: // move last point up
1012 case GDK_KP_Up:
1013 case GDK_KP_8:
1014 if (!MOD__CTRL) { // not ctrl
1015 if (MOD__ALT) { // alt
1016 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
1017 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
1018 }
1019 else { // no alt
1020 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
1021 else pen_lastpoint_move(pc, 0, nudge); // no shift
1022 }
1023 ret = TRUE;
1024 }
1025 break;
1026 case GDK_Right: // move last point right
1027 case GDK_KP_Right:
1028 case GDK_KP_6:
1029 if (!MOD__CTRL) { // not ctrl
1030 if (MOD__ALT) { // alt
1031 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
1032 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
1033 }
1034 else { // no alt
1035 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
1036 else pen_lastpoint_move(pc, nudge, 0); // no shift
1037 }
1038 ret = TRUE;
1039 }
1040 break;
1041 case GDK_Down: // move last point down
1042 case GDK_KP_Down:
1043 case GDK_KP_2:
1044 if (!MOD__CTRL) { // not ctrl
1045 if (MOD__ALT) { // alt
1046 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
1047 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
1048 }
1049 else { // no alt
1050 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
1051 else pen_lastpoint_move(pc, 0, -nudge); // no shift
1052 }
1053 ret = TRUE;
1054 }
1055 break;
1057 /* TODO: this is not yet enabled?? looks like some traces of the Geometry tool
1058 case GDK_P:
1059 case GDK_p:
1060 if (MOD__SHIFT_ONLY) {
1061 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
1062 ret = TRUE;
1063 }
1064 break;
1066 case GDK_C:
1067 case GDK_c:
1068 if (MOD__SHIFT_ONLY) {
1069 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
1070 ret = TRUE;
1071 }
1072 break;
1074 case GDK_B:
1075 case GDK_b:
1076 if (MOD__SHIFT_ONLY) {
1077 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
1078 ret = TRUE;
1079 }
1080 break;
1082 case GDK_A:
1083 case GDK_a:
1084 if (MOD__SHIFT_ONLY) {
1085 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
1086 ret = TRUE;
1087 }
1088 break;
1089 */
1091 case GDK_U:
1092 case GDK_u:
1093 if (MOD__SHIFT_ONLY) {
1094 pen_lastpoint_tocurve(pc);
1095 ret = TRUE;
1096 }
1097 break;
1098 case GDK_L:
1099 case GDK_l:
1100 if (MOD__SHIFT_ONLY) {
1101 pen_lastpoint_toline(pc);
1102 ret = TRUE;
1103 }
1104 break;
1106 case GDK_Return:
1107 case GDK_KP_Enter:
1108 if (pc->npoints != 0) {
1109 spdc_pen_finish(pc, FALSE);
1110 ret = TRUE;
1111 }
1112 break;
1113 case GDK_Escape:
1114 if (pc->npoints != 0) {
1115 // if drawing, cancel, otherwise pass it up for deselecting
1116 pen_cancel (pc);
1117 ret = TRUE;
1118 }
1119 break;
1120 case GDK_z:
1121 case GDK_Z:
1122 if (MOD__CTRL_ONLY && pc->npoints != 0) {
1123 // if drawing, cancel, otherwise pass it up for undo
1124 pen_cancel (pc);
1125 ret = TRUE;
1126 }
1127 break;
1128 case GDK_g:
1129 case GDK_G:
1130 if (MOD__SHIFT_ONLY) {
1131 sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop);
1132 ret = true;
1133 }
1134 break;
1135 case GDK_BackSpace:
1136 case GDK_Delete:
1137 case GDK_KP_Delete:
1138 if ( pc->green_curve->is_empty() || (pc->green_curve->last_segment() == NULL) ) {
1139 if (!pc->red_curve->is_empty()) {
1140 pen_cancel (pc);
1141 ret = TRUE;
1142 } else {
1143 // do nothing; this event should be handled upstream
1144 }
1145 } else {
1146 /* Reset red curve */
1147 pc->red_curve->reset();
1148 /* Destroy topmost green bpath */
1149 if (pc->green_bpaths) {
1150 if (pc->green_bpaths->data)
1151 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1152 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1153 }
1154 /* Get last segment */
1155 if ( pc->green_curve->is_empty() ) {
1156 g_warning("pen_handle_key_press, case GDK_KP_Delete: Green curve is empty");
1157 break;
1158 }
1159 // The code below assumes that pc->green_curve has only ONE path !
1160 Geom::Curve const * crv = pc->green_curve->last_segment();
1161 pc->p[0] = crv->initialPoint();
1162 if ( Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>(crv)) {
1163 pc->p[1] = (*cubic)[1];
1164 } else {
1165 pc->p[1] = pc->p[0];
1166 }
1167 Geom::Point const pt(( pc->npoints < 4
1168 ? (Geom::Point)(crv->finalPoint())
1169 : pc->p[3] ));
1170 pc->npoints = 2;
1171 pc->green_curve->backspace();
1172 sp_canvas_item_hide(pc->c0);
1173 sp_canvas_item_hide(pc->c1);
1174 sp_canvas_item_hide(pc->cl0);
1175 sp_canvas_item_hide(pc->cl1);
1176 pc->state = SP_PEN_CONTEXT_POINT;
1177 spdc_pen_set_subsequent_point(pc, pt, true);
1178 pen_last_paraxial_dir = !pen_last_paraxial_dir;
1179 ret = TRUE;
1180 }
1181 break;
1182 default:
1183 break;
1184 }
1185 return ret;
1186 }
1188 static void
1189 spdc_reset_colors(SPPenContext *pc)
1190 {
1191 /* Red */
1192 pc->red_curve->reset();
1193 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1194 /* Blue */
1195 pc->blue_curve->reset();
1196 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1197 /* Green */
1198 while (pc->green_bpaths) {
1199 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1200 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1201 }
1202 pc->green_curve->reset();
1203 if (pc->green_anchor) {
1204 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1205 }
1206 pc->sa = NULL;
1207 pc->ea = NULL;
1208 pc->npoints = 0;
1209 pc->red_curve_is_valid = false;
1210 }
1213 static void
1214 spdc_pen_set_initial_point(SPPenContext *const pc, Geom::Point const p)
1215 {
1216 g_assert( pc->npoints == 0 );
1218 pc->p[0] = p;
1219 pc->p[1] = p;
1220 pc->npoints = 2;
1221 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1223 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1224 }
1226 /**
1227 * Show the status message for the current line/curve segment.
1228 * This type of message always shows angle/distance as the last
1229 * two parameters ("angle %3.2f°, distance %s").
1230 */
1231 static void
1232 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, Geom::Point const p, int pc_point_to_compare, gchar const *message)
1233 {
1234 g_assert(pc != NULL);
1235 g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1236 g_assert(message != NULL);
1238 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1239 Geom::Point rel = p - pc->p[pc_point_to_compare];
1240 GString *dist = SP_PX_TO_METRIC_STRING(Geom::L2(rel), desktop->namedview->getDefaultMetric());
1241 double angle = atan2(rel[Geom::Y], rel[Geom::X]) * 180 / M_PI;
1242 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1243 if (prefs->getBool("/options/compassangledisplay/value", 0) != 0)
1244 angle = angle_to_compass (angle);
1246 pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1247 g_string_free(dist, FALSE);
1248 }
1250 static void
1251 spdc_pen_set_subsequent_point(SPPenContext *const pc, Geom::Point const p, bool statusbar, guint status)
1252 {
1253 g_assert( pc->npoints != 0 );
1254 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1256 pc->p[2] = p;
1257 pc->p[3] = p;
1258 pc->p[4] = p;
1259 pc->npoints = 5;
1260 pc->red_curve->reset();
1261 bool is_curve;
1262 pc->red_curve->moveto(pc->p[0]);
1263 if (pc->polylines_paraxial && !statusbar) {
1264 // we are drawing horizontal/vertical lines and hit an anchor;
1265 Geom::Point const origin = pc->p[0];
1266 // if the previous point and the anchor are not aligned either horizontally or vertically...
1267 if ((abs(p[Geom::X] - origin[Geom::X]) > 1e-9) && (abs(p[Geom::Y] - origin[Geom::Y]) > 1e-9)) {
1268 // ...then we should draw an L-shaped path, consisting of two paraxial segments
1269 Geom::Point intermed = p;
1270 pen_set_to_nearest_horiz_vert(pc, intermed, status, false);
1271 pc->red_curve->lineto(intermed);
1272 }
1273 pc->red_curve->lineto(p);
1274 is_curve = false;
1275 } else {
1276 // one of the 'regular' modes
1277 if (pc->p[1] != pc->p[0]) {
1278 pc->red_curve->curveto(pc->p[1], p, p);
1279 is_curve = true;
1280 } else {
1281 pc->red_curve->lineto(p);
1282 is_curve = false;
1283 }
1284 }
1286 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1288 if (statusbar) {
1289 gchar *message = is_curve ?
1290 _("<b>Curve segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1291 _("<b>Line segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1292 spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1293 }
1294 }
1296 static void
1297 spdc_pen_set_ctrl(SPPenContext *const pc, Geom::Point const p, guint const state)
1298 {
1299 sp_canvas_item_show(pc->c1);
1300 sp_canvas_item_show(pc->cl1);
1302 if ( pc->npoints == 2 ) {
1303 pc->p[1] = p;
1304 sp_canvas_item_hide(pc->c0);
1305 sp_canvas_item_hide(pc->cl0);
1306 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1307 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1309 spdc_pen_set_angle_distance_status_message(pc, p, 0, _("<b>Curve handle</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle"));
1310 } else if ( pc->npoints == 5 ) {
1311 pc->p[4] = p;
1312 sp_canvas_item_show(pc->c0);
1313 sp_canvas_item_show(pc->cl0);
1314 bool is_symm = false;
1315 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1316 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1317 Geom::Point delta = p - pc->p[3];
1318 pc->p[2] = pc->p[3] - delta;
1319 is_symm = true;
1320 pc->red_curve->reset();
1321 pc->red_curve->moveto(pc->p[0]);
1322 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1323 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1324 }
1325 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1326 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1327 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1328 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1330 gchar *message = is_symm ?
1331 _("<b>Curve handle, symmetric</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only") :
1332 _("<b>Curve handle</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only");
1333 spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1334 } else {
1335 g_warning("Something bad happened - npoints is %d", pc->npoints);
1336 }
1337 }
1339 static void
1340 spdc_pen_finish_segment(SPPenContext *const pc, Geom::Point const p, guint const state)
1341 {
1342 if (pc->polylines_paraxial) {
1343 pen_last_paraxial_dir = pen_next_paraxial_direction(pc, p, pc->p[0], state);
1344 }
1346 ++pc->num_clicks;
1348 if (!pc->red_curve->is_empty()) {
1349 pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1350 SPCurve *curve = pc->red_curve->copy();
1351 /// \todo fixme:
1352 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1353 curve->unref();
1354 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1356 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1358 pc->p[0] = pc->p[3];
1359 pc->p[1] = pc->p[4];
1360 pc->npoints = 2;
1362 pc->red_curve->reset();
1363 }
1364 }
1366 static void
1367 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1368 {
1369 if (pc->expecting_clicks_for_LPE > 1) {
1370 // don't let the path be finished before we have collected the required number of mouse clicks
1371 return;
1372 }
1374 pc->num_clicks = 0;
1376 pen_disable_events(pc);
1378 SPDesktop *const desktop = pc->desktop;
1379 pc->_message_context->clear();
1380 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1382 pc->red_curve->reset();
1383 spdc_concat_colors_and_flush(pc, closed);
1384 pc->sa = NULL;
1385 pc->ea = NULL;
1387 pc->npoints = 0;
1388 pc->state = SP_PEN_CONTEXT_POINT;
1390 sp_canvas_item_hide(pc->c0);
1391 sp_canvas_item_hide(pc->c1);
1392 sp_canvas_item_hide(pc->cl0);
1393 sp_canvas_item_hide(pc->cl1);
1395 if (pc->green_anchor) {
1396 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1397 }
1400 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1402 pen_enable_events(pc);
1403 }
1405 static void
1406 pen_disable_events(SPPenContext *const pc) {
1407 pc->events_disabled++;
1408 }
1410 static void
1411 pen_enable_events(SPPenContext *const pc) {
1412 g_return_if_fail(pc->events_disabled != 0);
1414 pc->events_disabled--;
1415 }
1417 void
1418 sp_pen_context_wait_for_LPE_mouse_clicks(SPPenContext *pc, Inkscape::LivePathEffect::EffectType effect_type,
1419 unsigned int num_clicks, bool use_polylines)
1420 {
1421 if (effect_type == Inkscape::LivePathEffect::INVALID_LPE)
1422 return;
1424 pc->waiting_LPE_type = effect_type;
1425 pc->expecting_clicks_for_LPE = num_clicks;
1426 pc->polylines_only = use_polylines;
1427 pc->polylines_paraxial = false; // TODO: think if this is correct for all cases
1428 }
1430 void
1431 sp_pen_context_cancel_waiting_for_LPE(SPPenContext *pc)
1432 {
1433 pc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
1434 pc->expecting_clicks_for_LPE = 0;
1435 sp_pen_context_set_polyline_mode(pc);
1436 }
1438 static int pen_next_paraxial_direction(const SPPenContext *const pc,
1439 Geom::Point const &pt, Geom::Point const &origin, guint state) {
1440 /*
1441 * after the first mouse click we determine whether the mouse pointer is closest to a
1442 * horizontal or vertical segment; for all subsequent mouse clicks, we use the direction
1443 * orthogonal to the last one; pressing Shift toggles the direction
1444 */
1445 // num_clicks is not reliable because spdc_pen_finish_segment is sometimes called too early
1446 // (on first mouse release), in which case num_clicks immediately becomes 1.
1447 // if (pc->num_clicks == 0) {
1449 if (pc->green_curve->is_empty()) {
1450 // first mouse click
1451 double dist_h = fabs(pt[Geom::X] - origin[Geom::X]);
1452 double dist_v = fabs(pt[Geom::Y] - origin[Geom::Y]);
1453 int ret = (dist_h < dist_v) ? 1 : 0; // 0 = horizontal, 1 = vertical
1454 pen_last_paraxial_dir = (state & GDK_SHIFT_MASK) ? 1 - ret : ret;
1455 return pen_last_paraxial_dir;
1456 } else {
1457 // subsequent mouse click
1458 return (state & GDK_SHIFT_MASK) ? pen_last_paraxial_dir : 1 - pen_last_paraxial_dir;
1459 }
1460 }
1462 void pen_set_to_nearest_horiz_vert(const SPPenContext *const pc, Geom::Point &pt, guint const state, bool snap)
1463 {
1464 Geom::Point const origin = pc->p[0];
1466 int next_dir = pen_next_paraxial_direction(pc, pt, origin, state);
1468 if (!snap) {
1469 if (next_dir == 0) {
1470 // line is forced to be horizontal
1471 pt[Geom::Y] = origin[Geom::Y];
1472 } else {
1473 // line is forced to be vertical
1474 pt[Geom::X] = origin[Geom::X];
1475 }
1476 } else {
1477 // Create a horizontal or vertical constraint line
1478 Inkscape::Snapper::SnapConstraint cl(origin, next_dir ? Geom::Point(0, 1) : Geom::Point(1, 0));
1480 // Snap along the constraint line; if we didn't snap then still the constraint will be applied
1481 SnapManager &m = pc->desktop->namedview->snap_manager;
1483 Inkscape::Selection *selection = sp_desktop_selection (pc->desktop);
1484 // selection->singleItem() is the item that is currently being drawn. This item will not be snapped to (to avoid self-snapping)
1485 // TODO: Allow snapping to the stationary parts of the item, and only ignore the last segment
1487 m.setup(pc->desktop, true, selection->singleItem());
1488 m.constrainedSnapReturnByRef(pt, Inkscape::SNAPSOURCE_NODE_HANDLE, cl);
1489 m.unSetup();
1490 }
1491 }
1493 /*
1494 Local Variables:
1495 mode:c++
1496 c-file-style:"stroustrup"
1497 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1498 indent-tabs-mode:nil
1499 fill-column:99
1500 End:
1501 */
1502 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :